body{
    background-color: black;
}

ul {
    width: 200px;
}

li {
    height: 20px;
    text-align: center;
    background-color: plum;
    border-bottom: 1px solid black;
}

.box{
    width: 600px;
    height: 480px;
    margin: 200px auto 0;
    border: 2px solid purple;
}

.person1,
.person2{
    width: 40px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    color: yellow;
    background-color: cadetblue;
    border: 1px solid yellow;
}

.person2{
    right: 0px; 
}